Internal-grinding machine



H. F. JOSEPH. INTERNAL GRINDING MACHINE. APPLICATION FILED AIUGJ, Z920-Patented Nov. 8, 1921.

5 SHEETS SHEET I.

H. F. JOSEPH.

INTERNAL GRINDING MACHINE.

APPLICATION FILED AUGJ, 1920- 5 SHEETS-SHEET 2- Patented Nov. 8, 1921.

H. F. JOSEPH. INTERNAL GRINDING MACHINE.

APPLICATION FILED AUGJ, I920.

5 SHEETS-SHEET 3.

Patented Nov. 8, 1921.

$N Mm MN 7 QQ I Q Q NW1 I NM NM NM. $257 vvn N hm .Qm. F/4251929 714 I.".II IIIIIWVIIMI i vmzrvi 5 Av /44.552912. \h 7.

H. F. JOSEPH. INTERNAL GRINDING MACHINE. APPLICATION FILED AUGJ, I920.

1,396,123. Patented Nov. 8, 1921.

5 SHEETS-SHEET 4. s

H. F. JOSEPH.

INTERNAL GRINDING MACHINEJ APPLICATION FILED AUGJ, 1920.

Patented Nov. 8, 1921.

5 SHEETS-SHEET 5.

UNITED STATES PATIENT OFFICE.

HARRY F. JOSEPH, OF DAVENPORT, IOVA, ASSIG-NOR, BY MESNE ASSIGNMENTS, TOB. .'L. SCHMIDT COMPANY, A CORPORATION OF SOUTH DAKOTA.

IN TERNAL -GRINDING MACHINE.

Application filed August 7 T 0 all whom it may concern Be it known thatI, HARRY F. JOSEPH, a citizen of the United States, residing atDavenport, in the county of Scott and State of Iowa, have inventedcertain new and useful Improvements in Internal-Grinding Machines, ofwhich the following is a specification, reference being had to theaccompanying drawings.

This invention relates to grinding machines, and particularly tomachines for grinding the inner or outerfaces of automobilecylinders,'pistons, pins, valves, and in fact, all parts commonly foundon automobiles, though it is obvious the invention not limited to theuse for which it is particularly designed, as it might be used forgrinding cylinders or other parts for other mechanisms. 7

The general object of the invention is to provide a mechanism of thischaracter ineluding a grinding wheel which is rotatable and at the sametime may be moved in a circle around the central longitudinal axis ofrevolution or may be rotated without moving bodily around the centralaxis.

Afurther object'in this connection is to provide means whereby the tfeedof 'the grinding wheel may be controlled, this mechanism being such thatthe grinding wheelmay be fed in either direction while the machine isrunning.

A further objeot'is to provide 7 means whereby the rapid adjustmentof-the grinding wheel may be made by hand when the main bearingsupporting the grinding wheel and its parts is idle. A further object isto provide means whereby water maybe supplied to the grinding wheel andwhereby this water may be thrown'by the centrifugal action of the wheeloutward to the face of the work being acted upon. I

A further object is to provide means whereby the water used which isthrown outward against the work shall keep the grinding wheel spindlecool at all times.

Another object is to provide means which prevents the oil from thebearings of the grinding wheel spindle from getting upon the grindingwheel and prevents dust from the grinding wheel getting into thebearings.

A further object is to provide a guard for use in external grinding tothrow the water upon the revolving work.

Specification of Letters Patent.

Patented Nov. 8, 1921.

. 1920. Serial in. 401,988.

A further object is to provide very simple and effective means wherebythe grinding wheel may be adjusted while the spindle is rotating andwhile the spindle and grinding wheel are moving in a circular path, andwhereby the grinding wheel and spindle may be fed in one direction orthe other as desired.

And a further object is to provide means whereby the engagement of thedriving worm with the worm gear may be adjusted to take up wear.

Other objects will appear in the course of the following description.

My invention is illustrated in the accompanying drawings, wherein.Figure 1 is a side elevation of an internal grinding machineconstructed in accordance with myinvention; I

Fig. 2 is a rear end elevation of the machine; v

Fig; 3 is a fragmentary vertical sectional view through the housing 10and a portion of the base B taken on the line 3-3 of Fig. 4;

Fig. tis a detail rear elevation of the housing and bearings for thespindle;

Fig. 5 is a fragmentary vertical sectional view through the'rear end ofthe spindle and the bearings therefor showing the water ducts insection;

Fig. 6 is a fragmentary longitudinal sectional view through the forwardend of the Spindle and the grinding wheel mounted thereon;

Fig. 7 Fig. 6;

Fig. 8 is a section on the line 8-8 of Fig. 3 but showing the spindle inits lowermost position;

Fig. 9 is a sectional view on the line 9-9 of Fig. 8;

Fig. 10 is a top plan view of the construction shown in Fig. 8;

Fig. 11 is a sectional 11-11 of Fig. 10;

Fig. 11 is a fragmentary elevation looking from the rear of the feedingmechanism illustrated in Fig. 8;

Fig. 12 is a detail elevation partly in section of the joint between thespindle members 24 and 37;

Fig. 13 is a section on the line 13-13 of Fig. 12;

Fig. 1a is an elevation of the guard 102 is a section on the line 77 ofview on the line an approximately bodily around the axis a, and it inapplied position, the spindle housing being broken away; 7

Fig; 15 is a detail side-elevation of the guard with its shank.

Referring to the drawings, and particularly to Fig. 1, it will be seenthat my mechanism as a whole includes the base A, a supporting column Bwherein the spindle and spindle operating mechanism is supported, aswill be later described, and a work support C which is mounted forlongitudinal movement upon-the power driven table D and consists of aplurality of relatively ad iustable sections whereby the work may beshifted longitudinally of the table, transversely of the table, orrotated relative to the longitudinal axis of the table, and whereby thework may be held at any de sired elevation. This mechanism, which I havedesignated. generally A, B, C and D forms no part ofmy invention, mypresent invention residing in the means whereby the spindle carrying thegrinding head is rotated and given a bodily movement around a centralaxis, and whereby water is sup plied to the grinding wheel.

Referring to Fig. 3, it will be seen that the column B has rotativelymounted therein cylindrical carrier '10 which is provided intermediateits-ends with the gear 11. This cylindrical carrier is provided at itsends withthe inwardly directed, annular flanges 12 and 13 formingbearings for a spindle housing 14. This member 10 may be rotated by anysuitable mechanism, but I have illustrated for this purpose a shaftlacarrying a pinion or gear wheel engagingthe gear wheel 11 and drivenby a belt or sprocket chain 16, inturn operating over a belt wheel orsprocket wheel 17 car.- ried uponthe shaft 18 driven by a sprocxet chain1.9 from a sprocket wheel 20 on a motor shaft 21, the motor beingdesignated 22. I do not wish to be limited, however, to the particularmeans for driving the member 10. This member is entirely inclosed withinthe housing formed by the column B and the cap B thereof Disposed withinthe cylindrical carrier 10, as previously stated, is the spindle housing14, whiciiis annularin cross section, and this spindle housing 14, asindicated clearly in Fig. 4, is eccentrically disposed with relation tothe earrienlO so that as 10 rotates in the direction of the arrow inFig. 4, the spindle housing will be carried will be seen from Fig. 3that this spindle housing 14 has a passage 23 which is eccentric to theleriphery of the spindle housing. Extending through this passage 23 is aspindle, desig nated generally 24, and which, as illustrated, iscomposed of the two sections. This spindle is considerably longer thanthe spindle housing and projects beyond the spindle this carrier inwhich the forward portion of the spindle 24 is disposed and in which itis rotatably mounted. The forward end of the spindle 24 is mounted inexteriorly conical bearings 26, (see Fig. 6) while that portion of thespindle coincident with the forward spindle housing 25 is mounted inbearings 27 which are likewise conical.

The forward end of the housing 25 is screw-threaded, and engagedtherewith is a collar 28 having an annular flange 29 extending over'theend of the bearing 26'and by rotating this collar it is obvious that thewear on the hearing may be taken up. The spindle is reduced at thispoint, as at 30, and surroundingthe reduced portion of this spindle andbearing against the forward the forward portion of thiscollar 28 is adust cap 31 which rotates with the-spindle 24. Surrounding the body ofthe dust cap 31 is the grinding wheel 32 which may be an emery grindingwheel or carborundum grinding wheel, or a grinding wheel of any suitablecharacter, the face-of this grinding wheel being out out at its center,as at 33. The extremity of the'spindle 24is serewthreaded, and engagingthis screw-threaded portion is a nut 34 having-radially extending,relatively shallow passages'35, (see Fig. 7 and riveted to this nut is aplate 36. The spindle has a longitudinally extending bore 37 by'whichwater is supplied to the grinding wheel, and this bore flares forwardend and discharges water into the radial ducts 35 and by these radialducts the water is discharged against wheel 32 rear end of the flange29- of collar 28 and extending over toward its and'carried outward bycentrifugal actio against the work.

. The rear end of the spindle 24 projects beyond the cylindrical housing14. This housing 14 is cutout at its rear end to receive certainball'bearings, as will be later stated, and mounted upon the spindle 24are the two connected driving pulleys 38 and 39 nut 42 exteriorlythreaded to engage the 1nterior threads on the recess formed in the rearend ofthe housing 14, as most clearly illustrated in Fig. 5. The rearend of the housing 14 is exteriorly screw-threaded for engagement by thenuts 43, whereby the housing'is held in properrelation to the rotatablecarrier 10, which has an annular the split ring 43 plate 10 attachedto'it by screws and against which the nuts 43 bear, the forward end ofthe housing section 14 having a flange 44 which bears against the splitring 43. The nuts 43 pull. the spindle housing 14 against on the forwardend of the spindle housing and push the 7 rear split ring 43 against endflange plate 10 This insures perfect bearing at all times. Thus, thehousing section 14 is supported for relatively rotary movement withinthe r0- tatable carrierlO and the spindle is supported for rotationaround its own axis within the housings 14 and 25. Preferably thisspindle is formed in two sections, as shown in Fig. 12, one of thesections being so 'ewthreaded, as at 45, the other section having a head46'of the same diameter as the screwthreaded section, this head beingformed with a central, conical boss 47 seating within the'end of theother section, and these two parts being held from relative rotation bypins 48. The two sections are held together by a flexible couplingmember 49 having a flange to engage over the head 46 and beinginteriorly screi'v-threaded to engage over the screw-threads 45. Thiscoupling member is held in place by a nut 50.

It will be noted from Fig. 12 that the exterior face of the boss 47 isslightly curved or struck on a radius and that the rear face of theshoulder 46 also has a curve corresponding to the radius of thecurvature on the outer face of the boss 47 to thereby allow forflexibility in the coupling at this point, the pins 48 being relativelyloose in the sockets formed in the part 24 to permit this.

At its rear end, the spindle carries means whereby it may be connectedto a water supply pipe and to a pipe for carrying off excess water, andto this end, as illustrated in Fig. 5, the bore 37 at the rear end ofthe spindle is flared, as at 51, and this rear end of the spindle isexteriorly screw-threaded. Surrounding the rear end of the spindle is ahollow head 52 which is interiorly screwthreaded at its rear end, anddisposed within this 'screw threaded portion of the head is a housingnut 53 which is annular and carries a conical nozzle 54. This conical ortapered end is disposed within the flared rear end 51 of the bore37,-this nozzle being provided with a shoulder disposed between the nut53 and the rear end of the spindle. Surrounding and rotating with thespindle 24 are the internal bearing members 55 and 56 separated by aninternal spacing collar 57. Balls or otheranti-friction elements 58surround the bearing members 55 and 56 and roll against the outerbearing members 59 and 60 which fit within the head 52. Y The central,outer spacing collar 61 separates the outer bearing members 59 and 60.The bearing members 55 and 56 with the collar 57 areforced against theconical projecting shaft between the'bearing end 59 of the pulley 39 bymeans of a nut 62 engaging the screw-threadedrear end of the spindle Therear extremity of the nozzle 54 projects out beyond the nut 52 and isexteriorly screw-tln'eaded for engagement with the interiorscrew-threads of an elbow 63 which is connected by a flexible pipe 64 toa source of water. The water is preferably forced through this pipe by arotary pump (not shown). The housing nut 52-). as will be seen from Fig.5. is fl'll'lllQnl with a port 65 at one point in its circumference, andthis port alines with a passage 66 leading from the head or housing 52,and forms the means whereby the overflow from the housing or head may becarried off, this out let branch 65 connecting to a flexible pipe 67. Itwill, of course, be obvious from the above description that the spindlecan rotate freely within the housing 14 and within the head or housing52 and with reference to the nozzle 54, and that water may becontinuously supplied to the port of'the spindle and that overflow willbe carried off from the branch 66. The overflow passes out through thespace between the extremity of the nozzle 54 and'the flared end 51 ofspindle 24. Should there be no overflow space water would be forced intothe ball bearings. This overflow also allows drainage when supply ofwater is cut off.

In order to provide 'means whereby the grinding wheel may be adjustedtoward or from the axis a around which the grinding wheel rotates tothereby finely adjust the depth of cut, I provide means whereby thehousing section 14 and the housing section 25 withit may be axiallyrotated. To this end, I mount upon the forward end of the carrier 10 anapproximately annular plate 68 (see Figs. 3 and 8) having aneccentrically disposed, circular opening 69 which fits over the flange44 of member 14 and which is provided with a marginal flange 70 fittingover an annular rabbet or recess formed in the forward endof the carrier10. This plate 68 carries at one point on its periphery a bearingbracket 71 supporting a shaft 72 which, at its rear end, carries aratchet wheel 7 3, having radially projecting teeth. The opposite end ofthis shaft 72 carries a worm 74. Thisworm meshes with a worm wheel 75loosely mounted on a shaft 76 carried in bearings 77 on the plate 68.

One face of the worm wheel 75 carries upon it the clutch teeth 78, andcoacting with these clutch teeth is a clutch member 79 mounted upon theshaft 76. A coiled compression spring 80 bears against one of thebearing lugs 77 and against a collar 81 carried by the shaft 76 so thatnormally the clutch member 79 is urgedinto engagement with theclutch'tee'th 78 and thus'the worm wheel 75 is clutched to the shaft 76. This members 77 carries a worm 82, and at one extremity carries aknurled hand wheel or knob 83. The plate 68 is mounted upon the carrier10, and surrounding the extremity of the spindle housing 14 is a wormgear wheel 84. This worm gear wheel 84 has its central openingconcentric to the axis of the worm gear. This worm gear wheel isattached to the housing members 14 by screws 85. Worm 82 is keyed toshaft 76 by key 82 Coactin'g with the ratchet wheel 73, as will be laterdescribed, and'mounted upon the housing section B and, therefore, heldstationary relative to the rotation of plate 68 and bracket 71 is anupwardly projecting bracket 86 having two passages for the twolongitudinally shiftable pins 87 and 88 (see Figs. 10 and 11). The wallsof the pin passages in the bracket 86 are slotted, as at 89, and ears 90project from the pins 87-and 88 and extend into said slots. The rearends of the pins 87 and 88 are headed, as at 91,

and springs 92 urge these pins rearward, that is retract the pins.Mounted upon thesepins are the triangular cams 108 and 109. The cam 108has its angular face, that is the hypotenuse of the triangle, facingdownwardly and toward the leftin Fig; 8. The other cam 109 has itsinclined face or hypotenuse facing upwardly, this triangular faceextending downward and toward the left in Fig. 8.- Either of these camsis adapted to be manually projected into active position by pressing onthe appropriate knob 91', but'is normally retracted by the spring 92andheld thereby out of active position. 7

Mounted upon the shaft 72 rearward of the ratchet wheel 7 3 is a pawlcarrying lever 110. This lever is rotatable with relation to the shaft72 and is held in place by the screw 111. The ratchet wheel 73 is, ofcourse, fast on shaft 72. This lever projects laterally from its axis inone direction to form the relatively long arm of the lever, and theouter end of this arm is provided with a rearwardly projecting pin 112carrying a roller 113, as shown best-in Fig.11, which rolleris adapted,as the plate 68 is rotated, to engage with whichever cam 108 or 109 isprojected. This lever 110 carries upon it the substantially triangularpawl 114, which is triangular in form to provide the oppositelyprojecting teeth 115 and'116 engageable with the ratchet wheel 7 3. Theapex of the triangular pawl is engaged by a spring pressed pin 117 urgedtoward the pawl by a spring 118, as shown in Fig. 10. The extremity ofthis pin.117 is rounded and bears against the rounded apex of the pawland yieldingly holds the pawl in one or the other of its activepositions. The opposite extremity of the lever 110 is formed with a reentrantly'angledcface 119, and disposed on a bracket or lug ,120projecting from the bearing member 71 is aspringprojected pin 121projected toward the angular face 119 of the lever by means of a spring122. Extending from the bracket 71v and specifically from thebearingportion of this bracket is a lug or extension 123 having aforwardly tooth 116 in engagement with'the teeth of the ratchet wheel 73and bring the tooth 115 out of engagement with the teeth of the ratchetwheel 7 3. On the other hand, if the tooth 116 is engaged with theratchet wheel 7 3. then upon an upward movement of .the roller carryingend of the l'ever114 beyond a certain point, the tooth 115 will strikethe stop 124 and the position of the pawlwill be reversed. Itwili beseen that whenithe operator presses upon one or the other of the pins 87or 88, the corresponding cam 108 or 109 will be projected into the lineof rotation of roller 113, this roller being carried around with theplate 68 and with thermain bearing. The roller strikes and glides uponthe corresponding cam, andwhen it is struck the inclined end face ofthis cam will force the roller downward in one direction, and the pawl114 will carry the ratchet wheel around in one direction, thus giving apartial revolution to the ratchet wheel 73 and giving a partial rotationto the worm 74. This being engaged with worm gear7 5, revolves the wormgear, which in turn revolves the worm 82 and the worm gear wheel 84,thus making an adjustment of the emery wheel cut by moving the worm gearwheel 84 which is attached eccentrically to the rear spindle housing,said housing supporting the front spindle housing 25.- After the. roller112 has traveled overv the cam, as for instance the cam 108, and hasmoved off this cam, the lever 110 is brought back to its neutralposition by spring'plunger121; When a reverse adjustment of the feed isrequired, the operator forces out cam 109, for instance, and the roller113 will move over the upper face of this cam, thus shifting the leverin the opposite direction and thus feeding the ratchet wheel in theopposite direction and feeding the spindle oppositely. The pin which hasbeen'shifted to the proper position to operate the carn 108 will, ofcourse, need to be shifted to a reverse position in order to operate thecam109, and when the operator carries the cam 109 into position toengage the roller, the tooth 115 of pawl 114 will strike the stop 124,thus throwing the pawl slots 94in the plate 68.

into opposite center of the spring plunger 117 and causing the tooth 116to engage the ratchet teeth. If the pawl strikes the cam 108, a reverseaction takes place and the depression of the lever will cause the pawlto strike the stop 125 and the pawl will again be reversed. Thus thepawl is kept in one position or the other until the opposite cam isprojected. Of course, as soon as pressure is released from the pressbuttons 91, either cam will be retracted away from the line of rotationof the roller 113.

For rapid adjustment of the wheel, the

operator presses upon the knob or wheel 83,

which disengages the clutch 'member 79, thereby releasing all theautomatic .feed mechanism, and then by rotating the wheel or knob 83, adirect and rapid adjustment may be secured in the manner above indicatedthrough the action of the worm 82 on the worm wheel 84. Upon the releaseof the knob or wheel 83, the clutch member 79 is automatically reengagedwiththe worm gear wheel 75. r

it is desirable to provide means whereby the engagement between the wormgear 84 and the worm- 82 may be adjusted to take up wear. To this end,the front plate 68 is attached to the carrier or main bearing 10 b meansof cap screws 93 passing through Attached to the plate 68 by means of ascrew 95 is an eyebolt'or adjusting screw '96, through the eye of whichthe screw 95 passes, the shank being threaded. This screw-threaded shank96 passes through a" stud 97 which is screwed in the end of thecarrieror main bearing 10. The screw 96, of course, passes looselythrough the perforation in the stud 97 and on each side of this stud aredisposed the, knurled nuts 98 'and '99. By releasingthe cap screws 93",theifront plate- 68 can be drawn-around circumferentially by turning theknurled nut 99,"which action draws the worm 82 into deeper mesh'with theworm gear 84. Afterithe' desired adjustment has been made, the parts arelocked in their adjusted position by the lock nut 98 and the cap screws93;

It will be noted that the pivotal axis of the bearing-plate 68 isequi-distant from the axis of rotation o'f'the housing 10 and the axisofrotation of the spindle 24, thus permitting the axis ofthe' spindle24' to be located in coincidence with the axis of the housing. i 1

I will be seen from Figs. 1 and 2that the flexible pipes 64 and-67extend downward through slot 100 whichis formed in a yoke 101 which isrotatably mounted in and projects from the housing wall formed by thesupporting column B. This yoke 101 is a freely oscillata-ble yoke andthus takes care of the independent eccentric action of the head {orelbow 5 2 and"permitsthe free movement of the pipes 64 and 67 renderednecessary by this eccentric action of the various parts.

The work carriage C may beof any suitable design or character and isprovided with means whereby it may be longitudinally shifted toward orfrom the grinding wheel and the work raised or lowered, or the workturned into any desired angle with the axis of the grinding wheel. Ofcourse, it will be understood that other work supporting means may beused in'connection with the movable feed table D, and for various kindsof work, as for instance, rods, pins, cylinders, pistons, etc., and thatwhere rods or pins are to be ground, the rod or pin or other work willbe rotated and carrier 10 will be idle while spindle 24 will rotatearoundthe axis a, and that the same is true of grinding the exterior ofa cylinder or piston, but that when interior work is to be ground, thegrinding wheel is disposed within the hollow article and revolves aroundthe central axis a. WVhere external grinding is being done, a guard,such as shown in Fig. 14:, will be used. This guard 102 is approximatelysemi-circular in form and embraces the grinding wheel and is providedwith a shank portion 103 having clamps whereby it may be engaged withthe spindle housing. This guard is preferably in two halves hingedtogether and is clamped upon the main spindle housing 25 in any desiredposition. WVater will strike the guard and-be thrown off upon therevolving work. The pump which supplies water to the spindle iscontrolled by a knob 104 which, when shifted inward, throws the pump outof gear when the water supply is not desired, and which, when pulledoutward, throws the pump into gear. 106"(see Fig. 1) is used forshifting the clutch (not shown) which allows for throwing idle the mainbearing 10, that is for causing power to be transmitted to this mainbearing 10 or carrier. The throwing of this main bearing 10 idle doesnot, of course, stop the revolution of thespindle carrying emery wheel.The lever 107 is used for changing the speeds of the movable base D. Theclutch mechanism controlled by the lever 106 and the means for securingvariable speeds of the table:D have not been illustrated, as itis notbelieved necessary, as these parts are more or less old and Well own.

I have not-shown in detail the means for operating the work support tothereby feed the work, nor have I shown any means for controlling thespeed of the various shafts or the rotating speed of the spindle, or thespeed of revolution of the spindle and its grinding wheel around thecentral axis a, as these may be of any desired and obvious CQllStructioHI A lever will be obvious from what has as desired, eitherautomaticallyby forcing in one or the other'of the pins 87 or 88, ordisconnecting the clutch 79 the feed may be rapidly controlled by meansof the wheel 83. The feeding means which I have devised provides for anextremely fine adjustment of the feed capable of feeding the cut infractions of thousandths of an inch while 'the machine is, running. Theparticular construction of the grinding wheel and the means forsupplying water thereto provides for the water being sprayed outward bycentrifugal force against the face of the work where the Wheel is indirect contact with the work, thereby producing a maxi mum feed at the.point of engagement between the wheel and thework. At the same time,this water passing through the grinding wheel spindle acts to keep thespindle cool. Obviously other liquids than water might be used ifdesired.

While I have illustrated a construction which has been found thoroughlyeffective for the purpose intended, yet it will be obvious that manymodifications might be made in the details of constructionandarrangement of parts without departing from the spirit of theinvention.

I claim I 1. In a mechanism of the character .described, a tubularspindle, a grinding wheel mounted thereon and having a recess'in one endface, a nut engaging the spindle and bearing against the grinding wheeland disposed in said recessed end face, the outer face of said nuthaving radially extending grooves, and a-baflle plate attached to saidnut and extending over said recesses therein. 7 2. In a mechanism of;the character described, a tubular spindle reduced-at one end having anexterior screw-threaded extremity, the'bor'e of the spindle flaringtoward its extremity, :a grinding wheelsun rounding the reducedextremity of the spindle .and. having a recess in, its outer end face,and a nut engaging the screwthreaded extremity of-the spindle and disposed within, said recess, said nut having r'adial discharge-ductscommunicating with the bore of the spindle, and a. bafile plate 'rindingwheel and at the same time the attached to the face of said nut and forming the outer wall ofthe said ducts.

In a mechanism of the character described, a tubular, rotatable spindle,a hollow head into; which the end of the spindle extends, bearingsmounted in said hollow head supporting the spindle, a nozzle carried inthe hollow head and projecting loosely into the bore of the spindle, anda supply pipe connected to thenozzleb a. In a mechanism: of thecharacter described, a tubular, rotatable spindle, a hol low head intowhich the end of the spindle extends, bearings mounted in said hollowhead supporting the spindle, a nozzle carried in the hollow head andprojecting loosely into the boreof the spindle, a supply pipe connectedto the nozzle, and a discharge pipe' connected tothe head, the headhaving ducts communicating .with the interior of the spindle to carryoff the excess liquid. V p

5. In a'mechanism of thecharacter described, a tubular rotatablespindle, bearings supporting the spindle, a fixed hollow head into whichthe rear end of the spindle projects and open at its opposite ends,antifriction bearing elements disposed within the hollow headand'supporting the rear end of the spindle, a plug detachably closingthe rear end of the head, a' nozzle carried by said plug and discharginginto the bore of the spindle, and: a tubular water connectionoperatively engaged with the nozzle.

6; In a mechanism of the character described, a tubular rotatablespindle, bearings in which the spindle is supported, a fixed hollow headthrough which the rear end of the spindle projects and open at itsopposite ends, anti-friction elements disposed within the hollowheadandsupporting the rear end ofthe spindle," a plug having screw-threadedengagement with the rear end of thehead and having a central aperture, anozzle having its body rotatably mounted in said aperture, said Inozzledischarging into the bore of the spindle, and a tubularmemberYdet'achably engaging the rear extremity of the nozzleandconnected to a source of liquid supply.

7. Ina mechanism of i'the. character dey scribed, a tubular rotatablespindle, bearings supporting the spindle, a-hollow head into which therear .end' of'the spindle pro- 'ects'.;-said head having-an outleu-thebore of the spindle at the extremity disposed within the head beingoutwardly flared, a 7

member closingv the rear end of thehead a nozzlearotatably mounted insaid member and having a tapering forward end extending in to thefiared'extremity of the spindle, a water supply member operativelyengaging the extremity of thenozzle, and means for holding'thelextremityof the spindle in spaicedlrelation to=the extremity ofthe nozzle wherebyto leave tween the confronting faces of the spindle and nozzle, the headbeing formed with a discharge duct leading therefrom and into which saidspace opens.

S. in a mechanism of the character described, a tubular rotatablespindle, bearings in which the spindle is mounted, a hot low head intowhich the rear extremity of the spindle projects and having an inturnedflange at its forward end, an outer ball racedisposed against saidflange within the head, an inner ball spindle, anti-friction elementsdisposed between the races, inner and outer spacing sleeves abuttedagainst the races, an inner and outer race disposed against the rearends of the spacing sleeves, anti-friction members disposed between saidraces, a nut engaging the rear extremity of the spindle and bearingagainst the inner rearmost race, a plug having screw-threaded engagement'ith the rear end of the head and having a central aperture, the plugbeing hollowed out to form a circumferentially extending chambersurrounding said nut and having a discharge duct leading from saidchamber, a nozzle rotatably mounted in the opening of the plug andconfronting the rear end of the spindle and discharging thereinto, thenozzle and rear end of the spindle being an outlet space berace mountedon the spaced from each other to permit the discharge of water throughsaid space into said chamber and duct and a hollow water supply memberengaged with the rear end of said spindle.

9. A mechanism of the character described including a tubular spindle, agrinding wheel mounted thereon for rotation therewith, means for movingthe spindle bodily through a circular path eccentric to the axis of thespindle, means at the rear end of the spindle for forcing water into andthrough the tubular spindle, and means at the rear end of the spindlefor carrying off excess water.

10. A mechanism of the character described including a tubular spindle,a grinding wheel mounted thereon for rotation therewith, means formoving the spindle bodily through a circular path eccentric to the axisof the spindle, means at the rear end of the spindle for forcing waterinto and through the tubular spindle, and means at the rear end of thespindle for carrying off excess water, said means including flexiblepipes and a swivelly mounted yoke through which the pipes pass.

In testimony whereof I hereunto aflix my signature.

i H. F. JOSEPH.

